2. thanks for clearing that up. so even in a zero shift swing the right shoulder shifts planes
3. again on which plane?
The zero shift only applies to the clubshaft not shifting, not necessarily other components (like the right forearm, thanks Bagger). Look at 10-13. There are a number of different shoulder turns compatible to the zero shift clubshaft plane. The Standard turn (10-13-A) has the shoulder turning on a flat plane backwards and then on-plane downstroke. That is the one rwh is describing. Probably cause it's in the basic component list for hitting and swinging prescribed by Homer in section 12.
As far as I can tell, you could use an on-plane shoulder turn, but why argue with a man who wrote the book?
1. the shaft never changes plane
2. the sweetspot never changes plane
The correct answer is sweetspot
Quoting from the book 2-F, "Regardless of where the Clubshaft and Clubhead are joined together, it always feels like they are joined at the Sweet Spot - the longitudinal center of gravity, the line of pull of Centrifugal Force. So there is a 'Clubshaft' plane and a 'Sweet Spot', or 'Swing', Plane. But herein, unless otherwise noted, 'Plane Angle' and 'Plane Line' always refer to the Center of Gravity application."
A zero shift swing is still checked the same way many other instructors teach: the point of the clubshaft nearest the ground points at the plane line, except when the clubshaft is parallel to the ground, then it is parallel to the plane line.
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